Sadde's running.
Not for any particular reason, just because it's faster. He's been meaning to go to one of the capitals for a bit and now, he supposes, is as good a time as any.
And eventually he's not running anymore, because he's close enough to civilisation that someone might spot him. Not that he wouldn't be able to notice them by scent before they saw him, but still. And as he makes his way to the Norway capital at this more leisurely pace, he notices the tiny, shiny key. He walks towards it and picks it up and immediately notices just how magic it is. He can tell by the way the key feels like things, and different things depending on where it is.
He verifies that what the key feels like is consistent in absolute location by waving it around a bit and seeing that the same place always feels the same. "Huh," he murmurs to himself.
He straightens up and thinks. The first obvious thing to try is seeing whether it opens any doors—a universal skeleton key sounds like the kind of thing a magical key could be—but the second obvious thing can be tested right there and then. He pushes the key into thin air with some purpose, as if he wanted to unlock an invisible door, and then turns it, et voilà, the faintest of door-shaped outlines appears before him.
He locks the door, and it disappears. Unlocks it again, and there it is. So he pulls it open and sees—
"Mmhm. Any ideas on how we'd go about that? I can just try opening doors everywhere, I don't need to ever stop to rest, but some way to guide it would be useful."
"I haven't noticed the slightest correlation between anything and anything else to even design a test for."
"Yeah. This is a really annoying key. But I mean, there may be some correlation between things that isn't... immediately obvious. If we're going to basically go the brute force way anyway, I might as well arbitrarily choose to try to find places that feel the same way this world felt when I opened a door to it."
Sadde could spend quite a while doing this. Even without taking flight, there's a lot of volume in and around the house to cover.
Well, Cam might interrupt him now and then, irregularly, between time-occupying this-and-that.
Good! Interruptions are good, this is terribly boring. Fixing the world shouldn't be terribly boring.
Cam will do his best to make sure that the overall experience is pleasant.
Sadde's zipping this way and that really fast, though, and eventually he starts using his wings for new places to look.
Cam's adorable little planetoid is low-maintenance landscaped and attractive and cute.